SQL에서 각 행 값을 계산하는 방법

Question

나는 dr_amount, cr_amount 및 이들 사이의 균형을 running_balance로 표시해야하는 general_ledger 테이블을 보유하고 있습니다. 그것이 아래에 주어진 쿼리를 작성한 이유입니다. 그러나 현재 행의 균형과 같은 각 쿼리의 결과가 나타납니다. 하지만 남은 잔금으로 결과를 산출해야합니다. 첫 번째 행 dr_balance가 20000이고 cr_balance가 5000이고 나머지 잔액이 15000이라고 가정합니다. 두 번째 행에서는 cr_balance 만 5000입니다. 결과는 공제와 함께 10000이어야하지만 결과는 -5000입니다. 이 문제를 어떻게 해결해야할지 모르겠습니다. 아무도 이것에 나를 도울 수 있습니까? 나는 네 도움이 필요하다. 여기 내 쿼리는 아래와 같습니다 :

SELECT     '' AS cost_center_id 
             , '' AS cost_center_name 
             , '' AS office_code 
             , CONVERT('2013-02-01',DATETIME) AS transaction_date 
             , '' AS accounts_head_id 
             , '' AS account_name 
             , '' AS opposite_accounts_head_id 
             , '' AS opposite_account_name 
             , 'Opening Balance' AS particulars 
             , tempOpeningBalance.dr_amount 
             , tempOpeningBalance.cr_amount 
             , '' AS voucher_no 
             , '' AS vin 
             FROM (SELECT IFNULL(mcoa.account_code,'1101010101100321') AS account_code 
               , IFNULL(mcoa.account_name,'Cash') AS account_name 
               , IFNULL(mcoa.account_type,'ASSET') AS accountType 
               , CAST(IFNULL(SUM(IFNULL(maingl.dr_balance,0)),0) AS DECIMAL(27,5)) AS dr_amount 
               , CAST(IFNULL(SUM(IFNULL(maingl.cr_balance,0)),0) AS DECIMAL(27,5)) AS cr_amount 
               FROM master_chart_of_accounts AS mcoa 
               INNER JOIN chart_of_accounts AS coa ON (mcoa.id = coa.master_chart_of_accounts_id AND mcoa.id = 80) 
               LEFT JOIN general_ledger AS maingl ON (coa.id = maingl.accounts_head_id AND coa.account_code='1101010101100321') 
               INNER JOIN 
               ( SELECT gl.accounts_head_id, MAX(gl.gl_id) AS max_gl_id, gl.office_code, gl.office_type, gl.country_id,gl.cost_center_id 
                 FROM  general_ledger AS gl 
          -- INNER JOIN voucher_info AS vi ON (gl.voucher_info_id = vi.id) 
                 -- WHERE vi.posting_date < '2013-02-01' AND 
                 WHERE gl.transaction_date < '2013-02-01' AND 
                  gl.cost_center_id IN ('BI0000000000000000000001') AND 
                  gl.country_id IN (1) AND 
                  gl.office_code IN ('UG500013') AND 
                  1=1 
               GROUP BY gl.accounts_head_id, gl.office_code, gl.office_type, gl.country_id,gl.cost_center_id 
               ORDER BY gl.accounts_head_id 
               ) AS tmpgl 
               ON ( maingl.office_code = tmpgl.office_code 
               AND maingl.office_type = tmpgl.office_type 
               AND maingl.accounts_head_id = tmpgl.accounts_head_id 
               AND maingl.country_id = tmpgl.country_id 
               AND maingl.cost_center_id = tmpgl.cost_center_id 
               AND maingl.gl_id = tmpgl.max_gl_id 
                ) 
               WHERE mcoa.account_status_id = 1 AND 
                coa.account_status_id = 1 
              ) AS tempOpeningBalance 

UNION 

SELECT  vi.cost_center_id 
     , cc.center_name AS cost_center_name 
     , gl.office_code 
     , vi.posting_date AS transaction_date 
     , vd.accounts_head_id 
     , (SELECT chart_of_accounts.account_name FROM chart_of_accounts WHERE chart_of_accounts.id = vd.accounts_head_id) AS account_name 
     , vd.opposite_accounts_head_id 
     , (SELECT chart_of_accounts.account_name FROM chart_of_accounts WHERE chart_of_accounts.id = vd.opposite_accounts_head_id) AS opposite_account_name 
     , vd.particulars 
     , gl.dr_amount AS dr_amount -- here to check 
     , gl.cr_amount AS cr_amount 
     , vi.voucher_no 
     , vi.vin 
FROM general_ledger AS gl 
INNER JOIN voucher_info AS vi 
ON (gl.voucher_info_id = vi.id) 
INNER JOIN cost_center AS cc 
ON (vi.cost_center_id = cc.id) 
INNER JOIN voucher_details AS vd 
ON (vi.id = vd.voucher_info_id) 
INNER JOIN chart_of_accounts AS coa 
ON (vd.accounts_head_id = coa.id) 

WHERE vi.posting_date BETWEEN '2013-02-01' AND'2013-02-28' 
    AND vi.voucher_status_id = 3 
    AND vd.status_id = 1 
    AND vi.office_code = 'UG500063' 
    AND coa.account_code='1101010101100321' 
    AND coa.cost_center_id = 'BI0000000000000000000001' 
ORDER BY cost_center_name 
    , office_code 
    , transaction_date; 

Answer 1

은 테이블 자체가 값 같은 종류를 저장해야 내 소견으로이

SET @running_balance=0; 
SELECT dr_amount AS dr_amount 
     , cr_amount AS cr_amount 
     , @running_balance := (@running_balance + dr_amount - cr_amount) 
FROM general_ledger